Index: ObjFW.xcodeproj/project.pbxproj
==================================================================
--- ObjFW.xcodeproj/project.pbxproj
+++ ObjFW.xcodeproj/project.pbxproj
@@ -1937,11 +1937,10 @@
 				4BDF37B41338055600F9A81A /* config.h */,
 				4BEAF52519A8107500B61868 /* module.map */,
 				4BD98C011338140B0048DD5B /* objfw-defs.h */,
 			);
 			name = "Supporting Files";
-			path = ObjFW;
 			sourceTree = "<group>";
 		};
 		4B5C112717E9AAC1003C917F /* Forwarding */ = {
 			isa = PBXGroup;
 			children = (
@@ -3027,11 +3026,11 @@
 
 /* Begin PBXProject section */
 		08FB7793FE84155DC02AAC07 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0820;
+				LastUpgradeCheck = 0900;
 				TargetAttributes = {
 					4B0E296A1DA2A8A400323A76 = {
 						DevelopmentTeam = MXKNFCKFL6;
 						ProvisioningStyle = Automatic;
 					};
@@ -3755,16 +3754,22 @@
 /* Begin XCBuildConfiguration section */
 		1DEB919408733D9F0010E9CD /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
@@ -3803,16 +3808,22 @@
 		};
 		1DEB919508733D9F0010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = c11;